DE2520495C3 - Wide angle lens - Google Patents
Wide angle lensInfo
- Publication number
- DE2520495C3 DE2520495C3 DE2520495A DE2520495A DE2520495C3 DE 2520495 C3 DE2520495 C3 DE 2520495C3 DE 2520495 A DE2520495 A DE 2520495A DE 2520495 A DE2520495 A DE 2520495A DE 2520495 C3 DE2520495 C3 DE 2520495C3
- Authority
- DE
- Germany
- Prior art keywords
- lens
- wide
- positive
- angle lens
- angle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/04—Reversed telephoto objectives
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/64—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having more than six components
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Description
3535
1,751.75
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5. ,,5 < "*+Jh < 1,75, 50< *±*< 62.5. ,, 5 <"* + Jh <1.75, 50 <* ± * <62.
Hierbei bedeutetHere means
4040
4545
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Die Erfindung betrifft ein Weitwinkelobjektiv vorn Typ umgekehrter Teleobjektive gemäß dem Oberbegriff des Patentanspruchs.The invention relates to a wide-angle lens of the reverse telephoto type according to the preamble of the claim.
Augenblicklich besteht das Bestreben, photographische Objektive mit immer größerem Aufnahmewinkel bei möglichst kompakter Form herzustellen. Der Erfindung liegt daher die Aufgabe zugrunde, ein Weitwinkelobjektiv zu schaffen, dessen bildseitijje Schnittweite bei etwa dem l,6fachen der Brennweite des Objektivs liegt und das hinsichtlich der Abmessungen kompakt ist und eine verminderte Baulänge besitzt.At the moment there is a tendency to use photographic lenses with ever larger angles in the most compact form possible. The invention is therefore based on the object To create a wide-angle lens whose image side Back focus is about 1.6 times the focal length of the lens and that in terms of dimensions is compact and has a reduced overall length.
F = zusammengesetzte Brennweite des gesamten Objektivs,F = composite focal length of the entire lens,
1.2 ... , = Gesamtbrennweite einer aus der I. bis /-ten Linse bestehenden Linsengruppe,1.2 ..., = total focal length from the I. to / -th lens existing lens group,
r, = Krümmungsradius der ./-ten Linsen-Oberfläche, r, = radius of curvature of the ./- th lens surface,
dk = fc-te Abstand oder Linsendicke, d k = fc-th distance or lens thickness,
H, = Brechungsindex der d-Linie der f-ten Linse,H, = refractive index of the d-line of the f-th Lens,
i·, = Abbezahl der /-ten Linse.i ·, = Abbe number of the / -th lens.
Obwohl es an sich zur Korrektur der chromatischen Aberration günstig wäre, ist es vorzuziehen, wenn der mittlere Brechungsindex der Linsen 8 und 9 einen Wert von 1,75 nicht übersteigt, sofern man den v-Wert, günstige Massenproduktion und Kostenerhöhung bei dem Glasmaterial berücksichtigt.Although it would in itself be beneficial for correcting chromatic aberration, it is preferable if the mean refractive index of lenses 8 and 9 does not exceed a value of 1.75, provided that the v-value, cheap mass production and cost increase in the glass material are taken into account.
In den Zeichnungen, sind ein Schnittbild des erfindungsgemäßen Weitwinkelobjektivs und dessen Korrektionszustand dargestellt. Es zeigtIn the drawings, are a sectional view of the invention Wide-angle lens and its state of correction shown. It shows
F i g. 1 schematisch eine Ansicht der Linsenanordnung des Weitwinkelobjektivs gemäß der Erfindung undF i g. 1 schematically shows a view of the lens arrangement of the wide-angle lens according to the invention and
F i g. 2 verschiedene Aberrations-Kurven des Weitwinkelobjektivs, und zwar die sphärische Aberration, die Abweichung von der Sinusbedingung, die chromatische Aberration, die Verzeichnung und den Astigmatismus. F i g. 2 different aberration curves of the wide-angle lens, namely the spherical aberration, the deviation from the sine condition, the chromatic aberration, the distortion and the astigmatism.
Das Weitwinkelobjektiv gemäß der Erfindung weist die Konstruktionsdaten der ein Kennzeichen des Patentanspruchs enthaltenen Datentabelle auf.The wide-angle lens according to the invention has the design data of a characteristic of the Claim contained data table.
Hierzu 1 Etlatt ZeichnungenIn addition 1 Etlatt drawings
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5095474A JPS5510048B2 (en) | 1974-05-08 | 1974-05-08 |
Publications (3)
Publication Number | Publication Date |
---|---|
DE2520495A1 DE2520495A1 (en) | 1975-11-13 |
DE2520495B2 DE2520495B2 (en) | 1976-04-15 |
DE2520495C3 true DE2520495C3 (en) | 1979-10-18 |
Family
ID=12873206
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE2520495A Expired DE2520495C3 (en) | 1974-05-08 | 1975-05-07 | Wide angle lens |
Country Status (4)
Country | Link |
---|---|
US (1) | US3938883A (en) |
JP (1) | JPS5510048B2 (en) |
DE (1) | DE2520495C3 (en) |
GB (1) | GB1456622A (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5124223A (en) * | 1974-08-23 | 1976-02-27 | Asahi Optical Co Ltd | Kogatadeakarui retorofuookasugatakokakurenzu |
JPS6034730B2 (en) * | 1977-04-05 | 1985-08-10 | キヤノン株式会社 | Large diameter wide angle lens |
ATE275734T1 (en) * | 2000-12-18 | 2004-09-15 | Optische Systeme Goettingen Is | PROJECTION LENS |
JP4916198B2 (en) * | 2006-03-20 | 2012-04-11 | 株式会社リコー | Zoom lens, imaging device having zoom lens, camera device, and portable information terminal device |
RU2577082C1 (en) * | 2014-12-18 | 2016-03-10 | Открытое акционерное общество "Красногорский завод им. С.А. Зверева" | Apochromatic athermal lens (versions) |
CN109407275B (en) * | 2018-11-29 | 2024-01-16 | 福建福光股份有限公司 | Low-distortion light high-definition lens and imaging method thereof |
WO2021127820A1 (en) * | 2019-12-23 | 2021-07-01 | 诚瑞光学(常州)股份有限公司 | Camera optical lens |
TW202229980A (en) * | 2020-11-18 | 2022-08-01 | 中強光電股份有限公司 | Imaging system and projection apparatus |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3635546A (en) * | 1969-02-08 | 1972-01-18 | Nippon Kogaku Kk | Retrofocus-type lens system |
JPS512371B2 (en) * | 1971-12-08 | 1976-01-26 | ||
JPS5831569B2 (en) * | 1972-05-10 | 1983-07-07 | オリンパス光学工業株式会社 | A wide-angle lens with a moving lens near the aperture to correct close-up performance. |
-
1974
- 1974-05-08 JP JP5095474A patent/JPS5510048B2/ja not_active Expired
-
1975
- 1975-04-29 US US05/572,866 patent/US3938883A/en not_active Expired - Lifetime
- 1975-05-07 GB GB1922475A patent/GB1456622A/en not_active Expired
- 1975-05-07 DE DE2520495A patent/DE2520495C3/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB1456622A (en) | 1976-11-24 |
JPS50144435A (en) | 1975-11-20 |
JPS5510048B2 (en) | 1980-03-13 |
DE2520495B2 (en) | 1976-04-15 |
US3938883A (en) | 1976-02-17 |
DE2520495A1 (en) | 1975-11-13 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
C3 | Grant after two publication steps (3rd publication) | ||
8320 | Willingness to grant licences declared (paragraph 23) | ||
8339 | Ceased/non-payment of the annual fee |